[Iaude] CBET 4530: 20180703 : NOVA SCUTI 2018 = TCP J18292290-1430460 quai at eps.harvard.edu quai at eps.harvard.edu Mon Jul 2 20:49:06 EDT 2018 Previous message (by thread): [Iaude] MPEC N07: 2018 NA [a=1.56,e=0.48,i=2.6,H=23.1] Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Electronic Telegram No. 4530 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau at eps.harvard.edu (alternate cbat at iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network NOVA SCUTI 2018 = TCP J18292290-1430460 S. Nakano, Sumoto, Japan, reports the discovery by Y. Sakurai (Mito, Japan) of an apparent nova (mag 10.3) on two unfiltered CCD frames taken on on June 29.577 UT with a Nikon D7100 digital camera (+ 180-mm-f.l. f/2.8 lens). The position was measured to be R.A. = 18h29m22s.9, Decl. = -14d30'46" (equinox 2000.0); nothing is visible at this position on a CCD exposure taken by Sakurai on June 23.632 (limiting mag 12.1). Sakurai adds that a nearby variable star is located at position end figures 21s.88, 51".1. The preliminary designation TCP J18292290-1430460 was assigned to the variable when Nakano posted the discovery observation to the Central Bureau's TOCP webpage. Additional CCD magnitudes (unfiltered unless noted otherwise) for TCP J18292290-1430460: June 30.265 UT, V = 10.43, I_c = 9.35 (S. Kiyota; remotely with an iTelescope 0.61-m f/6.5 CDK astrograph near Auberry, CA, USA; position end figures 22s.93, 43".9); 30.528, V = 10.57, R = 9.69, I = 8.84 (K. Yoshimoto, Yamaguchi-ken, Japan, remotely using a 0.50-m f/6.8 reflector at Siding Spring, NSW; position end figures 22s.96, 44".0; image posted at website URL http://orange.zero.jp/k-yoshimoto/TCP-J18292290-1430460_0630.jpg; communicated by Nakano); 30.596, B = 12.16, V = 10.98, R_c = 10.37, I_c = 9.83 (Kiyota; remotely with an iTelescope 0.43-m f/6.8 CDK astrograph at Siding Spring); 30.939, V = 10.59 (A. Mantero, Cuneo, Italy, with a 0.25-m telescope; comparison-star magnitudes from UCAC4; position end figures 22s.96, 43".9); July 1.299, B = 12.29, V = 10.63, I = 8.53 (Yoshimoto; 0.43-m f/6.8 reflector near Mayhill, NM, USA); 1.470, 10.2 (T. Noguchi, Katori, Japan, 0.23-m f/10 Schmidt-Cassegrain reflector; position end figures 22s.98, 44".0; communicated by Nakano); 1.502, B = 12.40 (A. Pearce, Nedlands, W. Australia; remotely with a 0.43m f/6.8 telescope at Siding Spring; position end figures 22s.94, 44".0); 1.504, V = 10.90 (Pearce); 1.505, I = 8.77, R = 9.74 (Pearce); 2.217, V = 11.11 (B. Harris, New Smyrna Beach, FL, USA; via E. O. Waagen, AAVSO); 2.218, B = 12.46, R = 10.23 (Harris). E. O. Waagen, AAVSO, reports the following additional visual magnitude estimates for TCP J18292290-1430460: June 30.905 UT, 10.5 (R. Tyson, Freeport, NY, USA); July 1.056, 10.6 (G. Poyner, Birmingham, UK); 1.081, 10.7 (M. Deconinck, Artignosc sur Verdon, France); 1.890, 11.2 (W. Vollmann, Vienna, Austria); 1.904, 11.2 (Tyson); 2.022, 11.4 (A. Amorim, Florianopolis, Brazil); 2.103, 11.2 (Deconinck). P. Schmeer, Bischmisheim, Germany, writes that a variable star of G magnitude 12.85 has position end figures 24s.578, 47".30 (Bochum Galactic Disk Survey); he adds that nothing was visible to V magnitude 15.3 on the most recent ASAS-SN Sky Patrol exposure at the position of TCP J18292290-1430460, but that a patrol exposure shows the new variable at

V = 10.8 on July 1.438 UT, and that a possible progenitor is the Pan-STARRS1 source PSO J182922.940-143044.155 (position end figures 22s.935, 44".19; i magnitude 20.3). Visual magnitude estimates by Schmeer for TCP J18292290-1430460: June 30.897, 10.7; July 1.935, 10.9. O. Garde writes that a CCD echelle spectrogram (resolution 11000) taken with a 40.6-cm reflector at La Tourbiere Observatory in Chabons, France, on June 30.862 UT shows H-alpha with a classical P-Cyg profile; the spectrum can be viewed via website URL https://tinyurl.com/y9hkmsf4. Together with U. Sollecchia, Garde calls TCP J18292290-1430460 an optically thick classical nova (cf. URL http://www.astronomerstelegram.org/?read=11802). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. 2018 July 3

(C) Copyright 2018 CBAT (CBET 4530)

Daniel W. E. Green

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